The measurement results for the temporal evolution of the radius ratio (the black plots in Fig. REF ) can be seen to decrease with time.
The elapsed time for the filament to pinch off increases as the molecular weight of PEO increases.
In the elasto-capillary (EC) regime, which is an important indicator when determining the viscoelastic properties, the radius \(R_\mathrm {mid}\)  decays exponentially with time \(t\)  [1]}, [2]}, [3]}, [4]}, [5]}:
\(\frac{R_\mathrm {mid}(t)}{R_{0}} = \left(\frac{GR_{0}}{2\gamma }\right)^{1/3}\exp \!\left(-\frac{t}{3\lambda _{E}}\right),\) 
